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![Calcea Johnson and Ne'Kiya Jackson posing side by side.](https://cdn.mos.cms.futurecdn.net/psFTJQWoWPUjRUUgkYHnrf-320-80.jpg)
High school students who came up with 'impossible' proof of Pythagorean theorem discover 9 more solutions to the problem
By Sascha Pare published
In a new peer-reviewed study, Ne'Kiya Jackson and Calcea Johnson outlined 10 ways to solve the Pythagorean theorem using trigonometry, including a proof they discovered in high school.
![A close-up of a gilded astronomical clock on a clock tower that reads "Anno Domini" in the center](https://cdn.mos.cms.futurecdn.net/AxRsePkxHAsdxpzUBsfHU4-320-80.jpg)
Keeping time: The history, origin and meanings of B.C. and A.D.
By Robert Coolman, Owen Jarus last updated
The use of "anno domini" and "before Christ" to mark time began in the early days of Christianity, when clerics needed to know when Easter would fall.
![List of prime numbers below 100 on paper in vintage type writer machine from 1920s closeup with paper.](https://cdn.mos.cms.futurecdn.net/cuKXtXX33AtQss7hfxXMda-320-80.jpg)
What is the largest known prime number?
By Charles Q. Choi last updated
There are infinitely many prime numbers, but the biggest one we know of goes by the name M82589933 and contains more than 24 million digits.
![An infinity symbol glows against a dark background.](https://cdn.mos.cms.futurecdn.net/GFtp7uGszbDeAcTK9cteZG-320-80.jpg)
The 9 most massive numbers in existence
By Tia Ghose last updated
From the humble trillion to Graham's number, here are some of the most massive numbers ever conceived by humans.
![A draw housing six Sapphire Technology AMD graphics processing units (GPUs).](https://cdn.mos.cms.futurecdn.net/MJVdhkakmQy2JYaWWdYGmb-320-80.jpg)
Largest known prime number, spanning 41 million digits, discovered by amateur mathematician using free software
By Ben Turner published
A draw housing six Sapphire Technology AMD graphics processing units (GPUs).
![An illustration with a red background and four organically-shaped blobs](https://cdn.mos.cms.futurecdn.net/JrSXxxtiXnzDrM76x3utFA-320-80.jpg)
The '3-body problem' may not be so chaotic after all, new study suggests
By Skyler Ware published
Scientists studying the infamous 3-body problem have discovered certain "islands of regularity" that emerge from the gravitational chaos.
![An illustration of a black hole](https://cdn.mos.cms.futurecdn.net/6CV32AfaetuBuKc2xZwwi3-320-80.jpg)
Black holes from the universe's infancy could reveal invisible matter
By Paul Sutter published
New theoretical research suggests primordial black holes could one day help researchers locate invisible dark matter.
![An illustration showing the universe expanding over time](https://cdn.mos.cms.futurecdn.net/zVuYCPfCYJ54gV2VaiXAGm-320-80.jpg)
The universe may end in a 'Big Freeze,' holographic model of the universe suggests
By Paul Sutter published
New research suggests holographic dark energy could stop the universe's expansion.
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